7. when two or more species live together in a close, long-term relationship, it is called

8. a symbiotic relationship in which both participating species benefit is called

9. a symbiotic relationship in which one species is neither harmed nor called

7: symbiotic relationship
8: mutualism 
9: commensalism  

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.